I have written about Ketu conjunct the other planets. Ketu the headless graha internalises the planet he is with and changes his behaviour. This effect is quite significant if he is with your birth Moon (in about 8% charts). But the most challenging combination would be Ketu conjunct your ascendant lord. The probability that a planet is ascendant lord and conjunct Ketu in a chart is mathematically extremely low. Very few people have chosen this, as these energies are very unique and rather traumatic. If you are an evolved soul, this combination can gift you with immense spiritual progress after Ketu matures at the age of 48yrs. But before this happens life goes by in a strange daze.
The ascendant lord is the most important planet of your chart. The ascendant sign defines the personality and your environment. The exact rising degree is practically a graha/force in Jyotish (when you read the divisional charts). And its lord controls how your personality and your environment interact with each other. Eg if you have a powerful ascendant sign, both your personality, your environment will be equally beautiful. But the ascendant lord is in a bad position, you will not be comfortable with yourself nor be able to make full use of what is available to you in your environment.
If Rahu is desire, indulgence then Ketu is rehabilitation, revenge, rebalance, regeneration, renunciation. Ketu is primarily a malefic, related to catastrophes, karmic retribution, destruction of the material, inimical to Life. His results are not pleasing or satisfying to the body/mind, though they may be good for your soul’s spiritual progress. He is piercing, weird, eccentric, indifferent, separative, scorching. So the closer your ascendant is to Ketu, especially if both are in the same Nakshatra, you face a strange disconnect in every aspect of your life. Ketu brings in material adversities in any aspect of life he touches and obstructs the auspiciousness of the planet he touches. Ketu matures at the age of 48yrs, so he will hold back the maturity of the ascendant lord also till this age. There will be two very distinct and extreme phases in your life, before your 40s and after your 50s, with your 40s being the transition period.
Till you reach your 40s, you will be rather unpredictable, immature, prone to extremes of behaviour as Ketu’s intense impulses controls your interactions between your personality and your environment. Your mindset will be rather dark, you might prefer being alone, might get attracted to negative thoughts and behaviour. You are not very active, somewhat inert as you are not interested in anything much. You are more into your ‘Past Everything’ as you are determined to extract the last bit of information from your past lives, past interactions, past experiences etc. This might make you seem hazed out or vague. Thought processes can seem irrational as Ketu does not follow conventional logic. Ketu is instinctive and gets his information from very deep sources which are beyond comprehension to others. You might seem odd to others, your understanding is different, very deep. Clairvoyance, ‘clair-sentience’ exists. You can make that leap of intuition mixed with fiery intellect, a very unique and incisive logic which is always right. Your thought processes are subtle, sublime and your ideas are often so high up that you are often misunderstood by average people. You are not of this material world. Others might think that you imagine or make-up things but you are always proved right in the end.
Innocence is an overriding trait as ego does not exist, no action is motivated by selfishness as the sense of self itself is absent. You are shy, self-conscious, you do not have any sense of your own abilities and are highly impressionable. You always role-acting (can be a very good spy or professional actor) as you are not really interested in anything around you. You are an innocent and believe others to be innocent too but you can detect lies and fakes very easily. You want to know the truth of everything and you will work hard albeit in a disinterested manner to uncover it. Lies and falsehood will not be tolerated and if you have friends/family who lie to you, you will snap ties with them in an instant. You need fairness and justice in life. You like solving puzzles of every type, the mind likes finding solutions. If you get an idea, you stick to it, and it is generally correct, and you cannot be reasoned with. You have very strong likes and dislikes somtimes erratic and unpredictable. You might seem to be short-tempered, cruel and insensitive to others, but this is Ketu’s typical disinterest at work, you are not interested in them. Impulsiveness and intensity exists which comes from deep within your psyche and it is linked to the activities from your past lives. You are capable of staying alone in solitude for ages.
You are not religious in the conventional sense, occult is what you are. Occult is all those things which are mysterious and dangerous to others. You wander in areas which are very scary to others. Astrology, divination, tantra, telepathy, telekinesis, magic, hypnotism, astral stuff comes easily to you. In fact if others stare in your eyes for too long, you can actually mesmerise them. You are hypnotic, people find you mysterious and fascinating. You like travelling, physically/astrally and to places linked to secrets, mystery and occult. Research, searching for hidden things, secrets of the mind, studying the past eg archeology, inventing stuff, exploring underground treasures from minerals to the Kundalini are all possible. Obviously you are very sensitive to the astral dimensions, energy, ghosts, spirits etc. You know all secret things but you do not really care about all this. And you will face damage from these things, you are most vulnerable to damage from these ‘other things’ as you are apathetic to the things Ketu is linked to. You might be ill, hurt or simply overtired but you are not aware, you push your body (both physical and astral) beyond limits after which it can just snap. You should get yearly medical check-ups and also shield yourself from psychic damage. You will be prone to heat related diseases linked to problems of pran flow in your nadi-s. Take care of your physical eyes and nadis..
You are required to assimilate the lessons you have learnt from your past into your present, only then can you move ahead into the future. If Ketu can attach you to these past things then he himself is the force who can detach you from them in one sharp clean cut. He is the fog himself and will make you cut through his haze. Ketu is your deepest learnings from your past lives often associated with painful lessons. You will want to extract the least bit of information from these, and this process gives you tremendous pain on the emotional/ inner levels. But you are essentially indifferent to your self, so you go through this pain without any issue.
Ketu is illusion for those who operate on lower levels of consciousness but grants clarity and discerning insight to the evolved souls, as he can penetrate through all veils. If the chart shows an evolved soul then this weird influence of Ketu makes sense in the late 40s as the spiritual path becomes more obvious. A Seer, Sat-Guru can be produced with a strong Ketu+ascendant combination.
Spiritual practice or using your intelligence in a higher way can best channelise this Ketu+ascendant lord. Then you can come up with path breaking analysis which requires out of the box thinking. Any field linked to secrets, research, exploration, law, medicine, detection, crime, poisons, drugs, mind etc which requires incisive thinking is yours. Or you can also attain Moksh, as Moksh is essentially a paradox in the terms of this created worlds, a challenge well suited to your typical intelligence.
The placement, house/ sign in which this combination occurs will also matter. Also look into the houses placed in the 5/9 axis from this house. The ascendant lord in any house of the chart generally will give auspicious results or at least does not damage things too much. Whichever sign/ house the ascendant lord occupies gets more focus in the lifetime. However Ketu in the different houses requires analysis. One placement of Ketu+ascendant lord is especially powerful, if in Leo or the 5th house. This gives an independent spirit, an ability to transcend external influences, very deep perceptions and can dissolve the self-ego and grant you Moksh in this life itself.
But if this is not an evolved soul, then this combination affects longevity, mental balance, physical health and in fact every aspect of life, adversely. Whatever Ketu is capable of granting on the higher side as above will be affected by haze if he is functioning through his lower energy version. Then you become a ‘victim of circumstance’, your impulses and instinct get you into trouble. All the above positive attributes will be affected and there is more suffering in life. Ketu alone has the power to drastically reverse things and take things to extremes. So will it be a dramatic fall or rise in fortune, will depend on the power of the ascendant lord and the rest of the horoscope.
Ketu with the ascendant lord will, at some point of time, turn you into an ascetic, either visibly or internally. I have written about Ketu conjunct the individual other planets in my post here. Do go through it. Ketu with Jupiter takes away your luck and restricts auspiciousness in your life unless Jupiter has sufficient power to use Ketu’s abilities. If the ascendant lord Mars or Saturn is with Ketu, life will be intense and overall unhappy, even if they are relatively powerful in the chart. If Ketu is with a powerful Sun or Mercury as ascendant lord, then life can be manageable. Ketu with Moon as the ascendant lord can give high psychic abilities but will take you into the occult so living a normal life will not be very easy. Ketu with a powerful Venus ascendant lord will grant material dissatisfaction but can grant Moksh later in life.
You are the Nirvishesh Brahma, all our souls are the same Non-dual. And unless you realise your Reality, no other experience can really satisfy the soul. So Ketu in his real sense is the learning that there is no satisfaction in the things of this manifested universe. This learning is not made apparent till you experience the fun-fair of Creation and realise that it indeed does not satisfy. Thus the nameless longing to know real happiness, experience Moksh, intensifies. Ketu+Venus is the best possible Moksh-karak combination, in my opinion, for the spiritual aspirant. Ketu is the only force who can cut off all bonds and attachments to this manifested creation so completely that Moksh becomes possible. This is the real reason he is the most powerful of all the nava-graha.
(Someone in my family has a Ketu+Venus ascendant lord combination in D1 and Ketu+Moon in the D9. An interesting case study. Small things in her life also show this influence, dress sense is odd, got her nostril pierced and it got infected, eye vision went bad in childhood, debris in her 3rd eye chakra, highly intelligent but does not know where to use it, highly perceptive, not connected to her family, prefers being alone, highly educated, widowhood and remarriage, suffers routine injuries due to the occult, deeply into spiritual stuff, has occult abilities but is erratic etc.) Do keep a collection of sample charts of your family/friend circle, as you learn a lot from observing them on a regular basis.